Electrical bus support



Feb. 5, 1963 c. E. COREY ELECTRICAL BUS SUPPORT Filed ma 4, 1961 INVENTOR. CHARLES E. COREY HIS AT TomvEYs.

United States Patent fifice 3,076,867 ELECTRICAL BUS SUPPORT Charles E. Corey, Le Roy, N.Y., assignor to Lapp Insulator Company, Inc, Le Roy, N.Y., a corporation of New York Filed May 4, 1961, Ser. No. 107,766

4 Clain This invention relates to devices for use with insulating means for supporting electrical buses subjected to extremely high voltages. Known devices of this nature have commonly employed constructions having a bus seat bolted directly to an insulator cap, with the result that the projecting bolt heads have not only interfered with and limited the size of the supported bus, but have also contributed to the production of objectionable corona and radio interference voltages.

One object of the invention is to provide an improved construction which removes limitation on the size of the supported bus by the bolts for attaching the support to an insulator cap.

Another object is a construction affording effective shielding and grading of its parts and of the insulator cap, so as to prevent corona an insulator cap.

In the drawings:

FIG. 1 is an elevational view, partly in section and partly broken away, of an electrical bus support embodying the present invention.

FIG. 2 is a top plan view thereof, and

FIG. 3 is a fragmental sectional elevation of a modified construction.

The invention is embodied in the present instance, by way of illustration, in a construction comprising an adaptor for support on and adjustable attachment to the metal cap of a supporting insulator body, and a member adjustably secured to the adaptor for engaging and holding the bus on the adaptor. These parts are constructed and associated to provide freedom from restriction on the size of the bus by the means for attaching the adaptor to the cap, thus increasing the range in size of buses accommodated on a cap of given size. The means for securing the bus holding member to the adaptor provides, by adjustment therebetween, for either clamping the bus against movement, or holding it with a sliding fit, in proximity to the cap and insulator, and the construction affords selfcontained and effective shielding and grading of the parts and of the insulator cap, to prevent corona and objectionable radio interference voltages.

Referring more particularly to the drawings, there is shown at a metal cap for an insulator of known construction such as employed, for example, at the top of a stack or post type assembly, the cap being formed with a plurality of threaded bolt holes 12 arranged in a bolt circle, as well understood in the art. The adaptor part 14 is preferably circular and of generally plate shape as shown, having a flat lower surface 16 supported on the 3,076,867 Patented Feb. 5, 1963 top of cap 10. The upper surface 18 of the adaptor is formed with elongated and curved recessed portions 20 formed at their bottoms with curved slots 22 for the reception of bolts 24 for engagement in the bolt holes in cap 10. A recess 25 in the adaptors upper surface provides a seat for the bus 27 and locates it nearer the insulator cap. This construction affords a rotary adjustment of the adaptor on the insulator cap to align it with the bus to be supported. The peripheral edge of adaptor 14 is curved to afford shielding and grading for the parts including the insulator cap, the edge preferably having a curve wtih a diameter equal to the thickness of the adapt-or plate.

The recessed portions 20 of the adaptor have a depth greater than the heads of the bolts 24 for attaching it to the insulator cap, as shown, so that the bolt heads are depressed below the upper surface of the adaptor, to avoid interference with the bus holding member mounted on the adaptor as hereafter described.

The bus holding member 26 is preferably of substantially the shape of an inverted U, with an internal curvature conforming to the curvature of the outer surface of the bus, to engage over and hold the same firmly against lateral movement. The depending sides of member 26 terminate in oppositely extending flanges 28 formed with recessed portions 30 for the reception of means for securing the same to the adaptor. Such means preferably comprises a pair of bolt openings 32 through the bottom of each flange depression 30, in position to register with threaded openings 34 formed in adaptor plate 14 adjacent its outer edge, as shown. Bolts 36 inserted through the openings in flanges 28 and into the corresponding openings in the adaptor, serve to secure member 26 to the adaptor with the heads of bolts 36 depressed in the recessed portions 30 of member 26 to avoid the creation of corona effects.

With the arrangement of parts shown in FIG. 1, the bus holding member 26 may be drawn downwardly by bolts 36 so as to firmly and immovably clamp the bus against the seat 25 in the adaptor. However, to hold the bus with only a slip 38 (FIG. 3) may be interposed about the bolts 36 between the bus holding member 26 and the adaptor 14 so as to prevent tight clamping of the bus and maintain it in a slip fit in the member 26, to accommodate variations in the length of the bus due to temperature changes and the like.

It will be noted that the corners of the bus holding member 26 are curved, like the edges of the adaptor, so as to afford self-contained shielding and grading for the several parts and the insulator cap.

The adaptor and bus engaging member 26 are preferably constructed of non-magnetic metal, such as aluminum or bronze and preferably a high strength aluminum alloy.

The construction of the adaptor by which the bolts for attaching it to the insulator cap are depressed in the recessed portions of the adaptor serves to position the bolts below the upper surfaces of the adaptor and at a minimum distance above the insulator cap, thus removing them from interference with the bus and its securing means. By varying the diameter of the adaptor and the extension laterally of the flanges 28 of the holder, free of interference by the bolts 24, the support is adapted to accommodate buses of varying diameter for insulator caps of the same size. The construction likewise positions the bus at a minimum distance above the insulator cap with improvement in the operating characteristics and the strength of the construction.

It will thus be seen that the invention accomplishes its objects and while it has been herein disclosed by reference to the details of preferred embodiments, it is to be underfit in the support, spacing washers stood that such disclosure is intended in an illustrative, rather than a limiting sense, as it is contemplated that various modifications in the construction and arrangement of the parts will readily occur to those skilled in the art, within the spirit of the invention and the scope of the appended claims.

I claim:

1. An electrical bus support that is adapted to accommodate a tubular bus and that is adapted to be mounted on an insulator cap that is formed with threaded holes for the reception of attaching bolts, comprising an adaptor plate of generally circular shape that has substantially parallel, generally flat upper and lower surfaces, said adaptor plate being formed in its upper surface with a plurality of recesses and with elongate, bolt-receiving slots in said recesses, said recesses being suficiently deep to receive the bolt heads therein with the tops of the boltheads disposed below the upper surface of the adaptor plate, said adaptor plate also being formed in its upper surface with a transversely-extending concave channel that is adapted to receive the lower portion of a tubular bus therein, said elongate slots being formed and disposed to be substantially equidistant from the center of the adaptor plate and to permit the alignment of the adaptor plate on the insulator cap to receive the bus in said channel, said adaptor plate also being formed with a plurality of threaded, bolt-receiving holes therein that are disposed to be substantially equidistant from the center of the adaptor plate and to be at least as far from the center of the adaptor plate as are said slots, and a holding member that has a generally inverted U-shaped vertical transverse section and that is formed to engage against the upper surface of the bus and to receive the bus therein, said holding member also being formed with oppositely extending flanges that are formed with recesses and with holes therethrough to receive bolts to engage in the holes in the adaptor plate to secure the holding member to the adaptor plate, the recesses in said flanges being sufiiciently deep toreceive the bolt heads therein with the tops of the bolt heads disposed below the upper surfaces of the flanges respectively, the lateral edges of the flanges being disposed respectively to be substantially uniformly radially spaced from the periphery of the adaptor plate.

2. An electrical bus support in accordance with claim 1 wherein the periphery of the adaptor plate is rounded to have a substantially semi-circular shape in vertical section, the diameter of the semi-circular shape being substantially the same as the thickness of the adaptor plate.

3. An electrical bus support in accordance with claim 1 wherein said concave channel is formed with a surface that is generated by the movement of one straight line along a curved path in parallelism with a stationary straight line and at a distance therefrom that is at least as great as the radius of the bus.

4. Means for supporting a tubular electrical bus on an insulator comprising an insulator cap that is provided with a flat upper face and with threaded holes that extend into the cap from said face for the reception of attaching bolts, an adaptor plate of generally circular shape that .4 has substantially parallel, generally flat upper and lower surfaces, said adaptor plate being formed in its upper surface with a plurality of recesses and with elongate, bolt-receiving slots in said recesses, said recesses being sufliciently deep to receive the bolt heads therein with the tops of the bolt heads disposed below the upper surface of the adaptor plate, a set of bolts engaged in the holes in the insulator cap and passed through the slots in the adaptor plate and securing the adaptor plate to said insulator cap, said adaptor plate also being formed in its upper surface with a transversely-extending concave channel that is adapted to receive the lower portion of a tubular bus therein, said elongate slots being formed and disposed to be substantially equidistant from the center of the adaptor plate and to permit the alignment of the adaptor plate on the insulator cap to receive the bus in said channel, said adaptor plate also being formed with a plurality of threaded, bolt-receiving holes therein that are disposed to be substantially equidistant from the center of the adaptor plate and to be at least as far from the center of the adaptor plate as are said slots, the periphery of the adaptor plate being rounded to have a substantially semi-circular shape in vertical section, the diameter of the semi-circular shape being substantially the same as the thickness of the adaptor plate, the concave channel in the adaptor plate being formed with a surface that is generated by the movement of one straight line along a curved path in parallelism with a stationary straight line and at a distance therefrom that is at least as great as the radius of the bus, and a holding member that has a generally inverted U-shaped vertical transverse section and that is formed to engage against the upper surface of the bus and to receive the bus therein, said holding member also being formed with oppositely extending flanges that are formed with recesses and with holes therethrough to receive bolts to engage in the holes in the adaptor plate to secure the holding member to the adaptor plate, the recesses in said flanges being sufficiently deep to receive the bolt heads therein with the tops of the bolt heads disposed below the upper surfaces of the flanges respectively, and a second set of bolts engaged in the holes in the adaptor plate and passing through the holes in the flanges of the holding member and securing the holding member over the tubular bus and to the adaptor plate, the lateral edges of the flanges being disposed respectively to be substantially uniformly radially spaced from the periphery of the adaptor plate.

References Cited in the file of this patent UNITED STATES PATENTS 1,767,398 Ramsey June 24, 1930 1,877,594 Van Rosen Sept. 13, 1932 1,997,627 Casey Apr. 1.6, 1935 2,415,649 Matthysse Feb. 11, 1947 OTHER REFERENCES Publication: Insulator and Electrical Equipment Catalog No. 28, published by Ohio Brass Co. of Mansfield, Ohio, 1953, page 11.5. 

1. AN ELECTRICAL BUS SUPPORT THAT IS ADAPTED TO ACCOMMODATE A TUBULAR BUS AND THAT IS ADAPTED TO BE MOUNTED ON AN INSULATOR CAP THAT IS FORMED WITH THREADED HOLES FOR THE RECEPTION OF ATTACHING BOLTS, COMPRISING AN ADAPTOR PLATE OF GENERALLY CIRCULAR SHAPE THAT HAS SUBSTANTIALLY PARALLEL, GENERALLY FLAT UPPER AND LOWER SURFACES, SAID ADAPTOR PLATE BEING FORMED IN ITS UPPER SURFACE WITH A PLURALITY OF RECESSES AND WITH ELONGATE, BOLT-RECEIVING SLOTS IN SAID RECESSES, SAID RECESSES BEING SUFFICIENTLY DEEP TO RECEIVE THE BOLT HEADS THEREIN WITH THE TOPS OF THE BOLT HEADS DISPOSED BELOW THE UPPER SURFACE OF THE ADAPTOR PLATE, SAID ADAPTOR PLATE ALSO BEING FORMED IN ITS UPPER SURFACE WITH A TRANSVERSELY-EXTENDING CONCAVE CHANNEL THAT IS ADAPTED TO RECEIVE THE LOWER PORTION OF A TUBULAR BUS THEREIN, SAID ELONGATE SLOTS BEING FORMED AND DISPOSED TO BE SUBSTANTIALLY EQUIDISTANT FROM THE CENTER OF THE ADAPTOR PLATE AND TO PERMIT THE ALIGNMENT OF THE ADAPTOR PLATE ON THE INSULATOR CAP TO RECEIVE THE BUS IN SAID CHANNEL, SAID ADAPTOR PLATE ALSO BEING FORMED WITH A PLURALITY OF THREADED, BOLT-RECEIVING HOLES THEREIN THAT ARE DISPOSED TO BE SUBSTANTIALLY EQUIDISTANT FROM THE CENTER OF THE ADAPTOR PLATE AND TO BE AT LEAST AS FAR FROM THE CENTER OF THE ADAPTOR PLATE AS ARE SAID SLOTS, AND A HOLDING MEMBER THAT HAS A GENERALLY INVERTED U-SHAPED VERTICAL TRANSVERSE SECTION AND THAT IS FORMED TO ENGAGE AGAINST THE UPPER SURFACE OF THE BUS AND TO RECEIVE THE BUS THEREIN, SAID HOLDING MEMBER ALSO BEING FORMED WITH OPPOSITELY EXTENDING FLANGES THAT ARE FORMED WITH RECESSES AND WITH HOLES THERETHROUGH TO RECEIVE BOLTS TO ENGAGE IN THE HOLES IN THE ADAPTOR PLATE TO SECURE THE HOLDING MEMBER TO THE ADAPTOR PLATE, THE RECESSES IN SAID FLANGES BEING SUFFICIENTLY DEEP TO RECEIVE THE BOLT HEADS THEREIN WITH THE TOPS OF THE BOLT HEADS DISPOSED BELOW THE UPPER SURFACES OF THE FLANGES RESPECTIVELY, THE LATERAL EDGES OF THE FLANGES BEING DISPOSED RESPECTIVELY TO BE SUBSTANTIALLY UNIFORMLY RADIALLY SPACED FROM THE PERIPHERY OF THE ADAPTOR PLATE. 